Jack



Dec. 7 192s. 1,609,886

C. W. RIPSCH JACK F/CLE FIG] INVENTOR. CHARLES W. RIPSCH A TTORNEYS.

JACK

Filed June 2 mm: III

F/GS

c. w. RIPSCH Y 2 Sheets-Sheet 2 CHARLES w. R/PS ATTORNEYS.

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Patented Dec. 7, 1926.

' U ITED AT S CHARLES W. BIPSCH, OE DAYTQN, OHIO.

JACK.

Application filed June 29, 1923 Serial No. 648,302.

My invention relates to jacks.

It is the object of my invention to provide a jack which may be readilyelevated or depressed by the positive action of the operating handle.

It is an additional object to providea jack which will descend whenunlocked under the weight of the load which it is supporting.

It is a further object to provide a jack in which this descent may becontrolled by a brake.

It is a further object to provide means of locking the jack at any pointin its descent, and also means forunlocking it,

It is a further object to provide this combination of parts at thebottom of the jack inorder to lower the center of-gravity and make thejack more convenient for operation with less interference totheoperating han dle of the jack when the jack is under load.

It is a further object of my invention to provide a jack in which theseveral parts are always in engagement with one another and whicheliminates any clutch or like mechanism for the engagement of the partsone with the other.

It is an additional. object to provide a common casing for all of thejack parts, including the brake and the lock, so that all the parts willbe lubricated from the lubricant in a single casing.

It is a further'object of my invention to provide a jack in which theseveral parts may be readily reached without removing all of the partsin the jack.

It is my object to provide a jack which is simple, has the minimum ofparts, and is very strong, and in which the rate of descent is alwaysWithin the control of. the

operator through a slight movement of the controlling handle.

It is my object to provide a jack which may be immediately arrested inits movement, so that the fin'estadjustment may be made.

Referring to the drawings:

Figure 1 is an elevation of the jack with the cover plate over the brakemechanism partially in section and partially removed;

Fig. 2 is an elevation of thejack with a quarter section removed on theline 2-2 of Fig. 4'

Fig.' 3 is a section on the line 3- 3 of' Fig.

. Fig. lisa section on the line 1-4: of Fig. Fig. 5 is an end elevationof the brake and lock mechanism with the cover, removed showing thebrake ring partially'in section to disclose the method, of mountinghelical springs.

Fig. 6 is an elevation of. thejack from the brake and lock side; i

Referring to the drawings in detail:

1 is a base having a plurality of strengthening ribs 2. Upon this baseis mounted a grooved plate 3 which. constitutes the lower member of cagefora ballbearing. This ball bearing consists oftheplate 3 andthe upperplate a between which in suitable grooves inv these plates, designated 5and 6 respectively, are located the balls 7 Jou1' naled' in these platesis the base 8 of the main elevating screw. Fixed tot-his screw inpermanent engagement therewith and turning with it is the beveled ear 9on which are formed the teeth 10. fiesting on the gear and surroundingthe stem of the screw is aspacing collar 11 above which is the flight ofthe screw 12. The top 13 of; the screw is located beneath a cap plate 14upon which the load to be elevated rests. This plate is formed integralwith a sleeve 15 which travels within the main tubular casing 16 withinthe jack and is guided thereby. The sleeve 15 is provided with ashoulder or ring 17 against which abuts a nut 18 internally threaded at19. This nut engages with the screw 12.

The gear 9 has a cutaway portion on its under surface in. order toreceive a. worm wheel 20 which is pinned thereto by the pins 21. Thisworm wheel meshes with a worm 22 mounted upon ashaft 23 which isjournaled at either. end as at 24 and 25. in the housing, inclosing themechanism of the jack. On this shaft 23 is mounteda gear 26 meshingwith, a pinion 27 on a second shaft 28 journaled in the housing andparallel to the first shaft 23. A cover plate 29 closes the housing and,concealsthe shaft and gears.

The gear 9 is driven by. a beveled pinion 30 having teeth 31 engagingwith the teeth 10 of the gear 9. This pinion is mounted on a stub shaft32 and is journaled in thehousing in a collar 33 in which, there is lo.-cated a'bearing 34. On this-stubfshaft is mounted a ratchet 35 withwhich engages I a pawl 36. having an 'actuatinghead 37, and

a spring which tends to maintain the pawl in engagement with the teethof the ratchet 35. This pawl is carried in a casing 39 which is integralwith the casing l0 which forms a socket for the reception of a jackhandle ll.

Returning to the second shaft 28, it will be observed that this shaft isprojected into a supplementary inclosed chamber 42. Within this chambermounted on the shaft is a brake drum d3. Surrounding the drum andslightly separated from it is the brake ring having a plurality ofcutaway cam shaped portions l5 in the periphery thereof. These camshaped portions are adapted to receive rollers 4.6 which are pressed inone direction by the helical springs 4:7 located in pockets 4:8 in thering 44.

Projecting in these cam shaped cutaway portions are the unlockinglingers carried on the spider 50, which in turn is mounted upon theoperating shaft 51 which projects through the cover plate 52 and isoperated by a handle F or the purpose of transporting the jack bodil",rollers are mounted on one side of the base so that when the jack istipped by a lever inserted in the socket 55, the jack may be wheeled toa new position.

Opem ton.lt will be observed that in the operation of this jack that theack may be positively moved upwardly or downwardly by the ratchet andpawl and the jack lever. It is customary, however for the jack todescend under the weight of the lead. A it is always in engagement withthe braking mechanism, unless restrained the worm, wheels, gears,

' shafts and brake drum will turn, not only these fingers from the whenthe jack goes up, but when the jack goes down. When the jack goes upthere is no tendency of the rollers to lock or to brake the ascent butwhen the ack starts to descend he rollers will engage with the brakedrum and the surface, and thereby effect a braking and ultimately alockinn of the parts to one another. The helical i ring impels eachroller to locking positron.

In order to effect the unlocking of these rollers, the fingers l9 aremoved by rotating the spioer 50 to dislodge the rollers from theirlocking position. Upon the release of rollers they are returned to thebraking or looking position when the jack is descending.

'lhe spider is impelled to its inoperative position by the spring 56.

This spider is controlled by the shaft 51 and the hand-lever 53, whichis closely adacent to the hand of the operator.

It is thus possible to effect a perfect adjustment of the descent of thejack.

This brake and lock will catch at any point, will immediately talre holdwith the exact extent of the braking minimum of lost motion, and thestrain of stopping will be put directly on the screw. By varying theextent of the frictional. engagement of the rollers and by varying theposition of the fingers on the spider, the action may be. regulated.

In this jacli; it possible to handle economically the lighter tonnagesin the neigh borhood of fifteen tons, and also it is possible to handlethe heavier tonnages of seventy live to one hundred tons.

By this arrangement the elevating is cured through the gearing whichgives a relatively high rate of elevation while the descent is regulatedat aslower rate through the worm wheel and worm and the braking andlocking mechanism.

1 do not desire to confine myself to the particular details ashereinbefore described, but comprehend within my invention a suitablemodification thereof for its practice.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. In a jack, a vertically extending elevating member, means to operatesaid elevating member, a worm wheel mounted on said elevating member andturning therewith in either direction, a supplementary shaft mounted ina plane adjacent the lower end of said elevating member, a worm carriedby said shaft and adapted to be engaged by said worm wheel, means forbraking the descent of said elevating member, and means operated by saidsupplementary shaft for actuating said said breaking means.

2. In a jack, a vertically extending elevating member, means to operatesaid elevating member, worm wheel mounted on said elevating member andturning therewith in either direction, a supplementary shaft mounted ina plane adjacent the lower end of said elevating member, a worm carriedby said shaft and adapted to be engaged by said worm wheel, means forbraking and automatically stopping the descent of said elevating member,and means operated said supplementary shaft for actuating said breakingand stopping means.

3. In a jack, a vertically extending elevating member, means to operatesaid elevating member, a worm wheel mounted on said elevating member andturning therewith in either direction, a supplementary shaft mounted aplane adjacent the lower end of said. elevating member, a worm carriedby said shaft and adapted to be engaged by d worm wheel. means forbraking and automatically stoppin the-descent of said elevating member,means operated bysaid supplementary shaft for actuating said braking andstopping means and means for controlling said braking and stoppingmeans. i

4. In a jack, an elevating and lowering til means, gearing for actuatingsaidlowering and elevating means, a worm wheel connected tosaidelevating means near the bottom thereof, a supplementary shaftmounted below the shaftby which said operating gearing is driven, a wormon said supple men tary shaft meshingwith said worm wheel; said worm andworm wheel being capable of turning in either direction with theelevating and lowering means, and means connected with saidsupplementary shaft tend-- ing to iocl: said jack from descent, andmeans to control the extent of said locking, whereby the jack maydescend freely, be controlled in its descent. or be entirely locked.

5. In a jack, an elevating and lowering means, a main shaft, gearingdriven by said shaft for actuating said lowering and elevating means, aworm wheel connected to said elevating means near the bottom thereof, asupplementary shaft located below said main shaft, a worm on saidsupplementary shaft meshing with said worm wheel, said worm and wormwheel being capable of turning in either direction with the elevatingand lowering means, and means connected with said supplementary shafttending to lock said jack from descent, and means to control the extentof said locking, whereby the ack may descend freely, be controlled inits descent, or be entirely locked, all of said parts being inclosed ina single casing.

6. In a jack, an elevating screw and nut, a stationary casing mounted onthe base of the jack, a sleeve actuated by said screw and travelling insaid casing, a bearing for sup porting said screw, gearing carried bysaid screw, actuating gearing for engaging the first mentioned gearing,a ratchet and pawl connected with said actuating gearing, asupplementary shaft located transversely to said elevating screw, a wormmounted thereon, said shaft being journaled in the casing, a worm wheelconnected to the first mentioned gearing and turning therewith in bothdirections, and engaging with said worm, a second supplementary shaftjournaled in said casing, gearing connected with the first supplementaryshaft, a brake drum mounted on the second shaft, a brake ringsurrounding said drum adjacent thereto having a plurality of cutaway camshaped portions, rollers in said cutaway portions, yielding means forforcing said rollers into position to lock said drum and ring when thejack is descendinc, and a plurality of unlocking fingers for controllingsaid locking and braking action between the rollers, the drum, and thering. and means for controlling the movement of said fingers, wherebythe descent of the jack may be controlled as desired.

7. In a jack, an elevating screw and nut, a stationary casing mounted onthe base ofthe ack, a sleeve actuated by said screw and travelling insaidcasing, a bearing for supporting said screw, gearing carried bysaid. screw, actuating gearing for engaging the first mentioned gearing,a ratchet and pawl connected with said actuating gearing, a transverselylocated supplementary shaft, a worm mounted? thereon, said shaft beingjournaledin the casing, a worm wheel connected to the first mentionedgearing and turning therewith inboth directions, and engagingwith saidworm, a second supplementary shaft journaled in said casin gearingconnected with the first supplementary shaft, a brake drum adjacentthereto having a plurality of cutaway cam shaped portions, rollers insaid cutaway portions, yielding means for forcing said rollers intoposition to lock said drum and ring when the jack is descending, and aplurality of unlocking fingers for controlling said locking and brakingaction between the rollers, the drum, and the ring, and means forcontrolling the movement of said fingers, whereby the descent of thejack may be controlled as de sired, said brake drum and said gearingbeing located at the base of the jack. is

8. In a self-lowering lifting jack, a standard having a chamber at oneside of its lower end; a ram reciprocable in said standard; a nut insaid ram; a rotatable screw in said nut a gear on the lower end of saidscrew; a driving gear meshing therewith; a worm gear beneath said screwgear and rotatable therewith; a worm meshing with and rotatable by saidworm gear; and mechanism within said chamber actuated by the rotation ofsaid worm for retarding the movement of said ram during the loweringthereof.

9. In a self-lowering lifting jack, a standard having a chamber at oneside of its lower end; a ram reciprocable in said standard; means forimparting reciprocatory movement to said ram including a gear rotatableabout the axis of said ram; a driving gear meshing with said rotatablegear; a worm gear beneath said rotatable gear and revoluble therewith; aworm meshing with and rotatable by said worm gear; and mechanismactuated by the rotation of said worm and enclosed within said chamberfor retarding the movement of said ram during the lower ing thereof.

10. In a self-lowering lifting jack, a stand ard having a chamber at oneside of its lower end; a ram reciprocable in said standard; means forimparting reciprocatory movement to said ram including a gear rotatableabout the axis of said ram; adriving gear meshing with said rotatablegear; a bearing plate beneath and revoluble with said rotatable gearprovided with worm gear teeth; a worm meshing with and rotatable by saidworm gear teeth; anti-friction members supporting said bearing plate;and mechanism Within said chamber'actuated by the rotation of said wormfor retarding the movement of said rain. during the lowering thereof.

11. In a self-lowering lifting jack a stand ard provided with a lateralhub and having a chamber at one side of its lower end; a removablebushing in said hub; a ram roeiprocable in said standard; means for im-')arting reeiproeatoiw mm'ement to said ram including a gear rotatableabout the axis of said ram; a driving gear meshing with said rotatablegear having its shal't positioned in said bushing; a worm gear beneathsaid r0- tatable gear and revolnble therewith; a worm meshing with androtatable by said worm gear; and mechanism within said chamber actuatedby said worm for retarding the movement of said ram during" the loweringthereof.

12. In a selt-l0wering lifting; jaclc, a standard having a chamber atone side of its lower end; a base threaded t0 the lower end of saidstandard; a ram reeiprocable in said standard; means for impartingreciprocatory movement to said ram including a gear rotatable about theaxis of said ram; a driving gear meshing with said rotatable gear; aworm gear beneath said rotatable gear and rerolnble therewith; a wormmeshing with and rotatable by said worm gear; a bearing disk positionedon said base; anti-friction members between said disk and worm gear; andmechanisn'i within said chan'lber actuated by said worm for retardingthe move ment of said ram din-mg the lowering thereof.

In testimony whereof, I aliix my signature.

CHARLES Vii RIPStll-l.

